android battery saver system research paper

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13 Mar 2020  ·  Goel Utkarsh , Ludin Stephen , Steiner Moritz · Edit social preview

A Web browser utilizes a device's CPU to parse HTML, build a Document Object Model, a Cascading Style Sheets Object Model, and render trees, and parse, compile, and execute computationally-heavy JavaScript. A powerful CPU is required to perform these tasks as quickly as possible and provide the user with a great experience. However, increased CPU performance comes with increased power consumption and reduced battery life on mobile devices. As an option to extend battery life, Android offers a battery-saver mode that when activated, turns off the power-hungry and faster processor cores and turns on the battery-conserving and slower processor cores on the device. The transition from using faster processor cores to using slower processor cores throttles the CPU clock speed on the device, and therefore impacts the webpage load process. We utilize a large-scale data-set collected by a real user monitoring system of a major content delivery network to investigate the impact of Android's battery-saver mode on various mobile Web performance metrics. Our analysis suggests that users of select smartphones of Huawei and Sony experience a sudden or gradual degradation in Web performance when battery-saver mode is active. Battery-saver mode on newer flagship smartphones, however, does not impact the mobile Web performance. Finally, we encourage for new website design goals that treat slow (and throttled-CPU) devices kindly in favor of improving end-user experience and suggest that Web performance measurements should be aware of user device battery charge levels to correctly associate Web performance.

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Title: web performance with android's battery-saver mode.

Abstract: A Web browser utilizes a device's CPU to parse HTML, build a Document Object Model, a Cascading Style Sheets Object Model, and render trees, and parse, compile, and execute computationally-heavy JavaScript. A powerful CPU is required to perform these tasks as quickly as possible and provide the user with a great experience. However, increased CPU performance comes with increased power consumption and reduced battery life on mobile devices. As an option to extend battery life, Android offers a battery-saver mode that when activated, turns off the power-hungry and faster processor cores and turns on the battery-conserving and slower processor cores on the device. The transition from using faster processor cores to using slower processor cores throttles the CPU clock speed on the device, and therefore impacts the webpage load process. We utilize a large-scale data-set collected by a real user monitoring system of a major content delivery network to investigate the impact of Android's battery-saver mode on various mobile Web performance metrics. Our analysis suggests that users of select smartphones of Huawei and Sony experience a sudden or gradual degradation in Web performance when battery-saver mode is active. Battery-saver mode on newer flagship smartphones, however, does not impact the mobile Web performance. Finally, we encourage for new website design goals that treat slow (and throttled-CPU) devices kindly in favor of improving end-user experience and suggest that Web performance measurements should be aware of user device battery charge levels to correctly associate Web performance.

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Web Performance with Android's Battery-Saver Mode

A Web browser utilizes a device's CPU to parse HTML, build a Document Object Model, a Cascading Style Sheets Object Model, and render trees, and parse, compile, and execute computationally-heavy JavaScript. A powerful CPU is required to perform these tasks as quickly as possible and provide the user with a great experience. However, increased CPU performance comes with increased power consumption and reduced battery life on mobile devices. As an option to extend battery life, Android offers a battery-saver mode that when activated, turns off the power-hungry and faster processor cores and turns on the battery-conserving and slower processor cores on the device. The transition from using faster processor cores to using slower processor cores throttles the CPU clock speed on the device, and therefore impacts the webpage load process. We utilize a large-scale data-set collected by a real user monitoring system of a major content delivery network to investigate the impact of Android's battery-saver mode on various mobile Web performance metrics. Our analysis suggests that users of select smartphones of Huawei and Sony experience a sudden or gradual degradation in Web performance when battery-saver mode is active. Battery-saver mode on newer flagship smartphones, however, does not impact the mobile Web performance. Finally, we encourage for new website design goals that treat slow (and throttled-CPU) devices kindly in favor of improving end-user experience and suggest that Web performance measurements should be aware of user device battery charge levels to correctly associate Web performance.

Utkarsh Goel

Stephen Ludin

Moritz Steiner

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ANDROID BATTERY SAVER SYSTEM

Author (s) : K.Dhanalakshmi& T.Monisha, Dr.T.Manikumar & Dr.K.Poongothai

Abstract : Saving power of Android enabled devices have become a significant issue with 400,000 such devices being activated daily. Android smartphones and tablets offer several power hungry hardware components and the app developers are exploiting these components at disposal to provide revolutionary user experience. But the battery life has not increased at the same pace to support the power demand. Thus many researches have been carried out to investigate how to minimize the power consumption in smartphones. This paper reports four different research themes towards the reduction of smartphone power consumption. Efforts have been made to survey Android power saving apps available in Google play Apps store as the basis to find out different power saving approaches, operations and limitations. Then we present four different avenues to prolong the batter life of Android devices. The first two approaches include usage pattern analysis to generate power saving profiles. The advantage being that the power saving profiles are customized to actual user behavior. Integrating a photovoltaic film on top of the smartphone and tablet touch screen to generate electricity is also mentioned.

Keywords : Saving power of Android enabled devices, Android devices, Battery

Conference Date : 17/09/2021

Pages : 227

Paper ID : IESMDT225

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Android Battery Saver System

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This System is an innovative Application allowing the System to take the usage from Build-in classes and put a list in front of the user for him to review. The List also consists of the applications taking the battery usage and also determines the battery level. If the Battery level is low and the consumption of apps is more the system will trigger an alarm telling the user to force stop or close the apps. This System uses Android Studio as its front end and doesn’t use any backend as this type of application doesn’t need one since it uses the data from the phone itself and projects to the user. So basically the system helps the user to refrain certain apps to consume more battery power and drain it quickly and user can take some actions on it.

• The user gets a list of applications usage in a single place.
• The system notifies the user if the battery is low and indicates which app is using more power.
• The consumption rate is accurate
• Also indicates which app consumes more power.

Disadvantages

• This system doesn’t use any backend.
• The system provides with less information then the phones build in app.

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International Journal of Advanced Research in Computer and Communication Engineering

A monthly Peer-reviewed / Refereed journal

ISSN Online 2278-1021 ISSN Print 2319-5940

Battery Saver in Android Studio

Kiran Donge, V.M. Rakhade

Abstract: Now a day 75 % of people or even more than that use Android Operating System in the world. Android Operating System has groundbreaking features like Mobile Hotspots, Calling, Texting, Gaming, WIFI, Bluetooth, etc in such small devices that fit in the palm. In between these revolutionary features, we are going to talk about the main feature which is its battery. Because of Battery, it is portable meaning, it can be carried anywhere and it doesn’t need to be connected continuously to an electric socket like desktops, TVs, etc while using it. But still, it needs to be charged at least once a day. Android Operating System uses a lot of resources which in turn reduces the battery charge too quickly. To tackle this situation much research has been done to optimize the Battery quality of android devices but with a limited supply of energy, the battery can’t withstand android applications for a long-time. There are various ways to enhance power management. One of them is a battery saver application. This application can help the user to reduce power consumption slightly.

Keywords: Smartphone Android Operating System, Battery Saver.

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Undergrad dissertation project to assist Android to save battery by saving stages of the foreground app in the local DB. The information saved for each app consists of: brightness level and frequency of each CPU core. For each app that is loaded by the user, a new config is created or a previous one is loaded.

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Routine Battery Saver

Android 10 introduces a battery saver schedule option called based on routine . This option allows an app chosen by the OEM to provide signals to the system for more intelligent battery saver scheduling. This option requires configuration, and is optional to implement.

Device configuration

Provider specification.

To notify the Settings UI that the device is configured correctly, use your config overlay to override the value config_batterySaverScheduleProvider with the package name of your app.

For example, if you want the app package com.google.android.apps.turbo to control the based on routine setting, then you would set this config value:

Now the phone should show the based on routine option. To verify, build your image, flash it to a phone, and navigate to Settings > Battery > Battery Saver > Battery Saver Schedule . The based on routine option should appear.

Default off threshold

The new config_dynamicPowerSavingsDefaultDisableThreshold field specifies a battery level at which the system turns off battery saver, if it was turned on by the based on routine scheduler. The system default is 80%, but you can change it.

App configuration

Permissions.

The APIs needed for the app to turn on battery saver from the app are protected by the permission android.permission.POWER_SAVER . This is a signature/privileged permission, so grant the app you want to be able to trigger battery saver this permission in your privapp-whitelist .

An example of granting the privapp permission to an app:

If you don't pre-grant this permission to the version of the app on the system image, the app can't acquire the permission or properly call the APIs. The system doesn't provide any feedback beyond the usual permission errors, so verify that you can call the APIs and observe their effects.

Installation

For based on routine to work properly, you must pre-install the app on the system image with the required permission. Give only one app the POWER_SAVER permission and allow it to control the based on routine APIs. Behavior of the feature when more than one app tries to use the permission and APIs is unsupported and unspecified.

Triggering battery saver

Assuming setup is successful so far, the OEM app specified in the config should be able to successfully call the associated method in PowerManager to trigger battery saver:

If the based on routine battery saver schedule option is enabled and the app calls this method with a true value for powerSaveHint , then battery saver turns on. Specify disableThreshold so that if the app can't communicate with the system, the system still knows at which battery percentage it's safe to turn off battery saver.

This API is subject to user overrides and battery saver snoozing in the same way as the percentage-based automatic battery saver. See the API documentation for more information.

To verify the APIs are called successfully, query settings global to verify that the backing setting changed value according to the API calls .

For example, if the user selected routine battery saver mode and the app is calling setDynamicPowerSaveHint(true, 10) , the global settings should have these values:

If you then call setDynamicPowerSaveHint(false, 25) , the values should be:

You can check these values using this adb command:

Verification

There's no automated way to verify this feature because there's no way to know what behavior an OEM will use to decide when to trigger routine battery saver mode. OEMs are thus responsible for testing their integration to make sure that the behavior meets expectations. In particular, verify that the device can fulfill the following tasks:

• The user selects based on percentage in the battery saver schedule UI and selects 15%. Battery saver should come on automatically ONLY when hitting 15% battery.
• The user selects based on routine in the battery saver schedule UI. When the app calls the API with true , battery saver turns on. Additionally, battery saver automatically turns off if the device is charged to the indicated threshold level and unplugged.
• The user selects none in the battery saver schedule UI. Battery saver should NEVER come on automatically.
• If the app turns on battery saver and the user manually overrides battery saver to be off again (using Quick Settings, Settings, etc.), it should STAY OFF until the user either turns it back on again manually or plugs the device in.

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Last updated 2024-03-18 UTC.